Union for lead pipes



(No Model.)

J. M'QALLISTER.

UNION FOR LEAD PIPES.

No. 417,393. Patented De0. l7, 1889* 1 w r M Y I .IIWIEWIIIIHIIHH UNITEDSTATES PATENT OFFICE.

JAMES MOALLISTER, OF ENGLEIVOOD, ILLINOIS.

UNION FOR LEAD PIPES.

SPECIFICATION forming part of Letters Patent No. 17,393, dated December17, 1889.

Application filed February 23, 1889- To all whom. it may concern.-

Be it known that I, JAMES lVICALLISTER, a citizen of the United States,residing at Englewood, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvements in Unions for Lead Pipes,which is fully set forth in the following specification, reference beinghad to the accompanying drawings, in which- Figure 1 is a plan View ofmy invention; Fig. 2, a longitudinal vertical central view taken on theline 2 2 of Fig. 1; Fig. 3, a central vertical view; of the three partsof which my coupler consists;- Fig. 4, an end view of one of thecouplers, with a portion shown in section, as indicated by the line 4 atof Fig. 3; and Fig. 5, a transverse sectional view taken at the line 5 5of Fig. 1.

Like letters refer to like parts in all the figures of the drawings. 1

The object of my invention is to make a union or coupling for lead orother soft-metal pipes that will be tight and readily coupled anduncoupled; and my invention consists in the special construction of thesleeves, which are secured to the ends of the lead pipes, respectively,that are coupled together; and it 1 further consists in the constructionof the coupling-nut, in combination with the other parts of the coupler.

In the accompanying drawings,A and B represent the ends of the leadpipes. The ends of these pipes are tongued and grooved, as clearly shownat O in Fig. 2, so that when the ends are brought together they make atight-fitting joint.

D and E are screw-threaded metallic sleeves, which are screwed upon theends of the lead pipes A and B sufliciently far so that the ends ofthese pipes project through the sleeves, as clearly shown in Fig. 2. Thesleeves D and E have interior screw-threads F. At one end'of each ofthese sleeves the screw-threads F are cut away, leaving a smoothinterior surface which will pass over the ends of the lead pipe; but oneportion of these smooth surfaces is wider, so as to leave the entirescrew-thread uncut, excepting as it is cut across its entire width, asclearly shown in the drawings. Above the end of the screw Serial No.300,978. (No model.)

thread which is cutaway, as above described, there is an opening Gthrough the sleeves. The end of the screw-thread is pointed at its inneredge,'which pointed end of the screw thread projects beneath the openingG and forms a cutting-edge, which will cut a groove or femalescrew-thread the exact size of the screw-thread F on the exterior of theend of the lead pipe, as the sleeve is screwed upon the end of the leadpipe the chip that is cut passing through the opening or hole G in thesleeve. The blank space H in the end of the sleeve in which the entireend of the screwthread is left to be pointed, as shown, receives the endof the lead pipe and enables me to readily engage the cutting-point ofthe screwthread with the exterior surface of the lead pipe and cut afemale thread thereon, in which the screw-thread exactly fits, becausethe full size of the end of the screw-thread is made into acutting-tool, with which the female thread on the exterior of the leadpipes is cut, and the pointed end of the screwthread F being directlybeneath the opening G, the part of the screw-thread which is cut awaybeing cut obliquely and forming one part of the opening G, the openingextending the entire width of the screw-thread F, one end of which ispointed. The cutting-point, standing in the middle of the opening,facilitates cutting a female thread on the exterior of the lead pipe theexact size of the screw thread F. By this construction of the sleeves Dand E, I am enabled to readily cut a thread upon the exterior of thelead pipes A and B, in which the screw-threads F on the exterior of thesleeves exactly fit, as the sleeves are screwed upon the ends of thelead pipe. The sleeve D has also an exterior screw-thread I at or nearits coupling end, between which and the shoulder J is a plane surface K.The sleeve E has also an exterior screw-thread L extending from itscoupling end to the shoulder M. The exterior screw-thread I on thesleeve D is a left-hand screw-thread and the exterior screw-thread L onthe exterior of the sleeve E is a right-hand screw-thread.

N is a coupling-sleeve nut having exterior right and left handscrew-threads O and P. Between the right and left hand screw-thread andP there is a space R wide enough to receive the left-hand screw-thread Ion the exterior of the sleeve D, so that when the sleevemut N is screwedupon the sleeve 1) sufficiently far it will turn freely on said sleevewithout turning off from the sleeve 1). \Vhen the sleeve E is placed sothat its exterior screw-thread will engage with the right-handscrew-thread on the interiorof the sleeve-nut N, the sleeved nut can befreely turned on the sleeve D, which will draw the sleeve E into thesleeved nut until the two ends of the lead pipe which project throughthe sleeves I) and E come in contact and their tongued and grooved edgesare firmly pressed together.

The Operation of my invention is as follows: The end of the lead pipe Ais inserted in the chamber H of the sleeve I), and by turning the sleevethe cutting-point of the screw-thread F cuts the thread on the exteriorof the end of the pipe A the full size of the screw-thread F, the chippassing out through the opening G, and the screw-thread F exactly fitsthe screw-thread where its pointed end cuts. The sleeve E is screwedupon the end of the pipe B in the same manner. The ends of the two pipesproject beyond the sleeves, as shown in Fig. 2. The

coupling-sleeve nut N, which has a right and left screw-thread, is thenscrewed upon the sleeve D, the left-hand screw being screwed upon theleft-hand screw-thread on the end of the sleeve.

The nut then swivels on the sleeve 1), so that when the sleeve E isplaced so as to engage its exterior screw-thread with the right-handscrew-thread of the sleevenut N the sleeve E is drawn into the sleevenutN and the pipes are coupled together.

Having thus fully described the operation and construction of myinvention, what I claim as new, and desire to secure by Letters Patent,1's

1. The sleeve having an interior screwthread F and chambered at one end,the inner edge of the chamber following the outer edge of thescrew-thread until it cuts across it at right angles, leaving thescrew-thread its full width throughout its entire length, excepting atthe pointed end, the point at the end of the screw-thread terminating inthe chamber, the point being at the inner edge of the screw-thread, andan opening G, beneath which the cutting, end of the screwthreadprojects, substantially as specified and shown.

2. In a union for lead pipes, the combination of the coupling-sleeve N,provided with a right and left hand screw-thread, and the space R, thesleeve D, with its exterior screwthread I and smooth exterior K,shoulder J, and the sleeve E, provided with the screwthread L,substantially as specified.

JAMES MCALLISTER.

\Vitnesses:

THOMAS WM. WATSON, ADOLPH ALTERMATT.

